a silly question here, but i'm just going through the disaster recovery
procedure....and what to do in case of harddisk failure.

i have a nice raid setup, and its no problem to recognize which
/dev/sdX has dropped out of the array, but how do you physically
identify for example /dev/sdf when opening the box and have 6 disks to
choose from?

i can't be the first with this question so i just wonder what "rules of
thumb" others use.

thanks for reading this anyway.

Back in the day when I used to use software RAID, I'd write on the drive
with sharpie or use a printed label somewhere obvious.